Transition in morphology and properties in bottom-up HPHT nanodiamonds synthesized from chloroadamantane (original) (raw)
* Corresponding authors
a Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic
E-mail: stehlik@fzu.cz
b New Technologies – Research Centre, University of West Bohemia in Pilsen, Pilsen, Czech Republic
c Department of Material Science and Metallurgy, Faculty of Mechanical Engineering, University of West Bohemia, Pilsen, Czech Republic
d Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež, Czech Republic
e Faculty of Environment, Jan Evangelista Purkyně University in Ústí nad Labem, Ústí nad Labem, Czech Republic
f Faculty of Electrical Engineering, Czech Technical University in Prague, Prague, Czech Republic
g Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Russia
Abstract
Direct bottom-up high pressure high temperature (BU_HPHT) synthesis of nanodiamonds (NDs) from organic precursors excels in the ability to control the size of the resulting BU_HPHT NDs via the temperature of the synthesis. Here we investigated size-dependent thermal, colloidal, and structural properties of the BU_HPHT NDs and focused on the transition in morphology and properties occurring at around 900 °C (≈2 nm). Using transmission electron microscopy, small angle X-ray scattering and atomic force microscopy we show that the sub-900 °C samples (<2 nm NDs) do not have nanoparticle character but 2D platelet morphology with sub-nm unit thickness. Correspondingly, sub-900 °C samples (<2 nm NDs) have a negative zeta potential and hydrophobic character and should be considered as a form of a molecular diamond. The above-900C (>2 nm NDs) samples have nanocrystalline character, positive zeta potential and are dispersible in water similarly to other types of hydrogenated NDs. By in situ Raman spectroscopy experiments, we show that the transition is also related to the structural instability of the oxidized sub-2 nm BU_HPHT NDs.
This article is Open Access
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Article information
DOI
https://doi.org/10.1039/D4NA00802B
Article type
Paper
Submitted
26 Sep 2024
Accepted
07 Mar 2025
First published
10 Mar 2025
This article is Open Access
Download Citation
Nanoscale Adv., 2025,7, 2575-2584
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Transition in morphology and properties in bottom-up HPHT nanodiamonds synthesized from chloroadamantane
S. Stehlik, P. Belsky, T. Kovarik, Z. Nemeckova, J. Henych, E. Ukraintsev, A. Vlk, M. Ledinsky and E. Ekimov,Nanoscale Adv., 2025, 7, 2575DOI: 10.1039/D4NA00802B
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